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Related Experiment Videos

A study of single drug particle adhesion interactions using atomic force microscopy.

J K Eve1, N Patel, S Y Luk

  • 1Molecular Profiles Ltd., 1 Faraday Building, Nottingham Science and Technology Park, University Boulevard, Nottingham NG7 2QP, UK.

International Journal of Pharmaceutics
|May 9, 2002
PubMed
Summary

This study quantifies adhesion forces between salbutamol particles and various surfaces using Atomic Force Microscopy (AFM). Adhesion ranked glass > lactose > salbutamol > PTFE, with tribocharging affecting PTFE interactions.

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Area of Science:

  • Pharmaceutical Sciences
  • Surface Science
  • Materials Science

Background:

  • Metered dose inhalers (MDIs) rely on the controlled release of active pharmaceutical ingredients (APIs).
  • Understanding particle-substrate interactions is crucial for optimizing MDI performance and preventing issues like particle aggregation or adhesion to device components.
  • Salbutamol is a widely used bronchodilator in MDI formulations.

Purpose of the Study:

  • To characterize the interaction forces between micronized salbutamol particles and different surfaces.
  • To quantify particle-substrate adhesion using Atomic Force Microscopy (AFM).
  • To establish a comparative adhesion ranking for salbutamol on various materials relevant to MDI technology.

Main Methods:

  • Utilized Atomic Force Microscopy (AFM) with a salbutamol-functionalized AFM tip.

Related Experiment Videos

  • Measured force-distance curves between the salbutamol tip and target surfaces (glass, lactose, polytetrafluoroethylene - PTFE).
  • Analyzed force-distance data to quantify particle-substrate adhesion forces.

    • Main Results:

    • Determined a distinct adhesion ranking: glass > lactose > salbutamol > PTFE.
    • Observed an increase in interaction force between salbutamol and PTFE upon repeated contact.
    • Attributed the increased interaction force on PTFE to tribocharging effects.

    Conclusions:

    • The study provides quantitative data on salbutamol adhesion to key MDI-related materials.
    • Results highlight the significant influence of surface material on salbutamol particle adhesion.
    • Tribocharging is identified as a factor influencing salbutamol-PTFE interactions, relevant for MDI device design and operation.